Burglar alarm



Ocf. 23, 1928. 1,688,628

P. K. MORROW ET AL BURGLAR ALARM Original Filed JAIL 1926 ROBE/f7 5 WE MORE 'ETORNEY Patented @ct. 23, 1928.

STA

PERCY K. MORROW AND ROBERT E. WETMOR-E, OF SEATTLE, WASHINGTON.

BUBGLAR ALARM;

Application filed January 9, 1926,

This invention relates to improvements in burglar alarms, and more particularly to a device of that character that will serve both as a window or door locking device and as an vention to provide a combined burglar alarm and window or door lock, that may be made and sold at a relatively small cost, which may be easily set and applied in use and which is positive in its operation.

More specifically stated, the object of the invention resides in the provision of a device 1 as above stated, comprising a brace member made up of two relatively movable parts adapted to be placed in engagement respec tively with upper and lower window sashes; one of said parts being equipped with a cartridge holder, a spring pressed hammer and a latch bar for holding the hammer and spring under tension and which is releasable by relative movement of the brace bar parts to permit the hammer to strike and thus discharge the cartridge.

Other objects of the invention reside in the various details of construction and combina tion of parts embodied in the invention and in their mode of operation.

In accomplishing the objects of the invention, we have provided the improved details of construction, the preferred forms of which are illustrated in the accompanying drawings, wherein- Figure 1 is a perspective view of a burglar alarm and locking device embodied by the present invention; showing the same as functionally applied to the upper and lower sashes of a window.

Figure 2 is a longitudinal sectional view of the device; the parts being shown in their relative positions when set.

Figure 3 is a side view of the device after being tripped, and showing it when used in connection with a door.

Figure 1 is a perspective view of the device.

Referring more in detail to the drawings The device, in its preferred form of construction, comprises a flat bar 1 beveled at its ends as shown, so that, when placed in use,

its lower end 2 may be seated flatly against a stop or block, as designated at 3. Such a block is shown in Figure 1 as being secured to the top rail 4 of the lower sash of a window and in Figure 3 is shown secured to the floor 5 adjacent a door, or the like 6,

Serial No. 80,182. Renewed May 9, 1928.

Slidably fixed to the under side and at the upper end of the bar 1 is a trip plate 7 which is held in co-extensive relation to the bar 1 by two screws, or the like, 8 which extend through slots 9 formed longitudinally in the plate and are fixed in the bar. The heads 10 of the screws retain the plate functionally in place so that it is movable a limited distance 111 the longitudinal direction of the bar. The outer end of the plate 7 is beveled the same as the upper end of bar 1 so that when in use it may engage flatly against the lower edge of a stop plate 11 which, as shown in Figure 1, would be fixed to the side rail 12 of the upper sash 13 of the window and when used with a door, as shown in Figure 3, would be fixed to the door.

Formed in the bar 1, in spaced relation below the lower end of the plate 7, is a hole 14 in which a blank cartridge 15 may be fitted, the cartridge being held in place by its rim and by the end of a plate 16 that is pivotally fixed by a rivet 17 to the bar. The end of the plate 16 which overlies the cartridge may be swung to one side to prevent insertion or removal of the cartridge from the hole and it is provided on its under side with a proecting point, or lug, 18, which engages with the base of the cartridge and serves as a firing 1n. Fixed. to the bar 1, near its lower end, by means of a rivet 19, is a leaf spring 20 which extends in the longitudinal direction of the bar and. at its free end has a hammer or lug 21 fixed thereto provided in itsund'er side with a transverse notch 21. The spring is of such length and is so disposed that when it is drawn outwardly and thus placed under tension and then released, the hammer lug will strike the plate 16 a blow that will cause the point 18 to discharge the cartridge.

The means for retaining the trip plate 7 and spring 20 set comprises a latch bar 25 that extends through an opening 26 in the bar 1 just below the lower end of plate 7. This pin is pivotally mounted on a pin 27 that is welded or otherwise secured to the bar 1 to extend across the opening 26. When the spring 20 is drawn outwardly, the outer end of bar 25 may be seated in the notch 21' of hammer 21 to retain the spring under tension. With the bar 25 in this position, as shown in Figure 2, its lower end engages with the lower end of tri plate 7 and retains the latter extended somewhat beyond the upper end of bar 1,

Assuming then that the device is so constructed and that with the parts set, it is placed in use as shown in Figure 1, should an attempt be made to raise the lower sash, or to lower the upper sash, the plate 7 acting against the lower end portion of latch bar 25 will cause the upper end of the latter to be unseated from the hammer 21 and the latter to be brought with considerable force by spring 20 against the plate 16 to thereby cause point 18 to fire the cartridge.

When the device is used in connection with the door, as shown in Figure 3, the opening of the door will likewise trip the hammer and fire the cartridge.

After the firing of the cartridge the device still serves as a brace bar lock to prevent opening of the window or door for the reason that the bar 1 and plate 7 are fixed securely together and are held with their ends firmly in engagement with the stops 3 and 11. v To set the device, it is removed from the window or door, the spring 20 pulled out wardly and held under tension by seating the outer end of bar 25 against the notch 21. The plate 16 is then swung to one side of the opening 14;, a cartridge 15 placed in the opening 14 and the plate again placed thereover. WVith the parts so set, the device is then placed functionally in position with the ends of bar 1 and plate 7 respectively, engaged with the blocks 3 and 11.

It is readily apparent that such devices may be made in various sizes, proportions.

I etc., in accordance with their special use, and

that details of construction could be varied from without departing from the spirit of the invention and for this reason it is not desired that the device be limited only to the details herein illustrated.

Having thus described our invention, What we claim as new therein and desire to secure by Letters-Patent, is:

1. A device of the character described, com prising a brace bar, a trip plate fixed slidably in co-extensive relation to the bar and movable a limited distance in the longitudinal.

fire the cartridge and a latch bar pivotally mounted on the brace bar for normally retaining the spring under tension and the trip plate extended and adapted to be moved by inward movement or" the trip plate to release the hammer.

2. A device of the character described, comprising a brace bar, a trip plate fixed slidably in co-extensiverelationto the bar and movable a limited distance in the longitudinal direction of the bar; said bar having an aperture therein for holding a cartridge, a'cartridge retaining plate pivotally mounted on the bar and having an end portion adapted to overlie the base of the cartridge, a firing point on said plate engageable with the cartridge, a leaf spring fixed at one end to the bar, a hammer at the free end of the spring adapted to strike said cartridge retaining plate to cause said firing point to fire the cartridge and a latch bar pivotally mounted on the brace bar for normally retaining the spring under tension and the trip plate extended and adapted to be moved by inward movement of the trip plate to release the hammer. I

3. The combination with upper and lower sashes of a window of stops fixed to said sashes, a brace bar seated at one end against one of said stops, a trip fixed slidably to the other end of the bar in co-extensive re lation thereto and engaging at its outer end with the other of said stops; said bar having an aperture therein for receiving a cartridge, a cartridge retaining plate pivotally mounted on the bar movable from and over the base of the cartridge, a firing point in said plate engageable with said base, a leaf spring fixed at one end to the bar, a hammer fixed to the other end of the'spring and adapted to strike the retaining plate to fire the cartridge; said hammer having a notch therein, a latch bar pivotally supported in the brace bar with one end adapted to seat in said hammer notch to retain the spring under tension and its other end engageable with the trip plate to normal- 1y retain it extended and adapted to be moved by inward movement of the trip plate incidental to opening of either window sash to release the hammer.

Signed at Seattle, King County, Washington, this 11th day of February, 1925.

PERCY K. MORROW. j ROBERT E. WETMORE. 

